Test PB Collection: FTE

Screen filters used in conjunction with sand media filters Photo L. SchwanklA pressurized screen filter may be the most economical choice for groundwater filtration, since it is effective at removing inorganic material.

Suction screen pre-filter with water jets to keep the screen clean. Photo: L. SchwanklA suction screen filter uses a coarse mesh (sizes range from 10 to 30) for prescreening; it is placed at the inlet of the pump intake pipe where surface water is being pumped.

Flushing of a drip tape lateral Photo: L. SchwanklPeriodic flushing is required to prevent clogging from sediments, particularly along the lower part of the drip line. A 200-mesh filter will not remove particles of fine sand, silt, and clay or fine particles of algae.

Gravity flow screen filter used in a citrus orchard Photo: L. SchwanklA gravity filter can be used with water that has a low to medium concentration of suspended solids (10 to 100 ppm). With this device, the water flows by gravity through a screen with a mesh size of 100 to 200.

Disc filter. Photo: Jack Kelly ClarkA disc filter consists of a stack of discs, each with a series of microscopic grooves. The dimension of the grooves determines the effective mesh size of the filter, ranging from 40 to 600 mesh. Water is filtered as it flows through the grooves.

Self-flushing lateral line end caps, used on a subsurface drip system in tree crops Photo: L.

Manifold flush valves for a row crop subsurface drip system Photo: L.

Water in an irrigation reservoir with a high organic contamination level Photo: L.

Storage tank for chemicals injected through the microirrigation system Photo: L.

Double-venturi injection system Photo: L. SchwanklTreating irrigation water with a biocide will minimize the growth of organic contaminants and often destroy the organic material, minimizing the clogging hazard. Three biocide methods are commonly used to treat irrigation water.